A cache of materials to make improvised explosive devices sits in a compound recently occupied by insurgents in Garmsir district, Helmand province, Afghanistan, Aug. 10, 2009. U.S. Marines discovered the materials during a patrol. (Photo by 1st Lt. Kurt Stahl, Regimental Combat Team 3.)

U.S. Marine Corps Cpl. Angelo Agudelo carries a bag of ammonium nitrate from a cache of materials to make improvised explosive devices found in a compound recently occupied by insurgents in Garmsir district in Helmand province, Afghanistan, Aug. 10, 2009. Agudelo is a team leader, assigned to Echo Company, 2nd Battalion, 8th Marine Regiment. (Photo by 1st Lt. Kurt Stahl, Regimental Combat Team 3.)

A U.S. Marine provides security while fellow Marines load imaterials to make mprovised explosive devices found in a compound into a mine-resistant, ambush-protected vehicle in Garmsir district in Helmand province, Afghanistan, Aug. 10, 2009. (Photo by 1st Lt. Kurt Stahl, Regimental Combat Team 3.)

U.S. Marines load materials to make improvised explosive devices found in a nearby compound into a mine-resistant, ambush-protected vehicle in Garmsir district in Helmand province, Afghanistan, Aug. 10, 2009. (Photo by 1st Lt. Kurt Stahl, Regimental Combat Team 3.)